@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(./inter-vietnamese-wght-normal-CBcvBZtf.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(./inter-latin-ext-wght-normal-DO1Apj_S.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(./inter-latin-wght-normal-Dx4kXJAl.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@property --ambient-hue{syntax:"<number>";inherits:true;initial-value:22}:root{--bg:#08080a;--ink:#f3f3f5;--ink-2:#a8a8b2;--ink-3:#8c8c97;--ink-fade:#8f8f9b;--line:#ffffff14;--line-2:#ffffff24;--glass:#18181e8c;--glass-2:#ffffff0f;--glass-strong:#121217b8;--glass-card:#16161cd1;--field:#0000004d;--sel:#ffffff14;--seg-on:#ffffff21;--track:#ffffff12;--switch-off:#ffffff29;--sheen:linear-gradient(140deg, #ffffff13, #fff0 40%);--rim:inset 0 1px 0 #ffffff17;--shadow:0 1px 1px #0000004d, 0 12px 32px -14px #000000b3;--shadow-lg:0 30px 80px -24px #000000d9;--accent:#ff6363;--accent-2:#ff9b58;--primary:#f3f3f5;--primary-ink:#0b0b0e;--primary-rim:inset 0 1px 0 #fff9;--good:#4ade80;--good-ink:#03210e;--good-bg:#4ade801f;--bad:#ff7a7a;--bad-ink:#2a0505;--bad-bg:#ff636321;--key-top:#ffffff1c;--key-bottom:#ffffff0a;--grid:#ffffff0d;--amb-l:62%;--amb-a:.42;--amb-b:.24;--amb-c:.2;--tab-l:72%;--tab-c:.15;--hue-ink-l:82%;--foot:#0000002e;--font:"Inter Variable", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--font-text:system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--radius:14px;--radius-lg:20px;--ease:cubic-bezier(.2, .8, .2, 1);--spring:cubic-bezier(.34, 1.56, .64, 1);--blur:blur(22px) saturate(165%);--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}:root[data-theme=light]{--bg:#f2f2f5;--ink:#111114;--ink-2:#4c4c56;--ink-3:#5f5f6a;--ink-fade:#4a4a55;--line:#14142817;--line-2:#14142829;--glass:#ffffff94;--glass-2:#ffffffb8;--glass-strong:#ffffffb8;--glass-card:#ffffffe0;--field:#ffffffd9;--sel:#1414280f;--seg-on:#fff;--track:#14142812;--switch-off:#14142829;--sheen:linear-gradient(140deg, #ffffffb3, #fff0 45%);--rim:inset 0 1px 0 #ffffffe6;--shadow:0 1px 1px #1414280a, 0 12px 32px -14px #14142838;--shadow-lg:0 30px 80px -24px #14142859;--accent:#c8283a;--accent-2:#e8603a;--primary:#131317;--primary-ink:#fff;--primary-rim:inset 0 1px 0 #ffffff29;--good:#13743a;--good-ink:#fff;--good-bg:#13743a1a;--bad:#c22a2a;--bad-ink:#fff;--bad-bg:#c22a2a14;--key-top:#fff;--key-bottom:#ececf1;--grid:#1414280e;--amb-l:80%;--amb-a:.6;--amb-b:.4;--amb-c:.35;--tab-l:60%;--tab-c:.16;--hue-ink-l:45%;--foot:#fff6;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}@media (prefers-color-scheme:light){:root[data-theme=system]{--bg:#f2f2f5;--ink:#111114;--ink-2:#4c4c56;--ink-3:#5f5f6a;--ink-fade:#4a4a55;--line:#14142817;--line-2:#14142829;--glass:#ffffff94;--glass-2:#ffffffb8;--glass-strong:#ffffffb8;--glass-card:#ffffffe0;--field:#ffffffd9;--sel:#1414280f;--seg-on:#fff;--track:#14142812;--switch-off:#14142829;--sheen:linear-gradient(140deg, #ffffffb3, #fff0 45%);--rim:inset 0 1px 0 #ffffffe6;--shadow:0 1px 1px #1414280a, 0 12px 32px -14px #14142838;--shadow-lg:0 30px 80px -24px #14142859;--accent:#c8283a;--accent-2:#e8603a;--primary:#131317;--primary-ink:#fff;--primary-rim:inset 0 1px 0 #ffffff29;--good:#13743a;--good-ink:#fff;--good-bg:#13743a1a;--bad:#c22a2a;--bad-ink:#fff;--bad-bg:#c22a2a14;--key-top:#fff;--key-bottom:#ececf1;--grid:#1414280e;--amb-l:80%;--amb-a:.6;--amb-b:.4;--amb-c:.35;--tab-l:60%;--tab-c:.16;--hue-ink-l:45%;--foot:#fff6;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}}*,:before,:after{box-sizing:border-box}html{background-color:var(--bg);scrollbar-gutter:stable}body{min-height:100vh;color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizelegibility;margin:0;font-size:1rem;line-height:1.6}h1,h2,h3{text-wrap:balance;margin:0;font-weight:650;line-height:1.15}h1{letter-spacing:-.035em;font-size:clamp(1.9rem,1.3rem + 2vw,2.5rem);font-weight:700}h2{letter-spacing:-.02em;font-size:1.2rem}h3{letter-spacing:-.01em;font-size:1rem}p{margin:0}a{color:inherit}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.icon{flex:none}.muted{color:var(--ink-2)}.faint{color:var(--ink-3)}.small{font-size:.875rem}.num{font-variant-numeric:tabular-nums}.good-text{color:var(--good)}.bad-text{color:var(--bad)}.danger-text{color:var(--bad)!important}.eyebrow{letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);margin:0;font-size:.75rem;font-weight:600}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.topbar,.hero-search,.badge,.stat,.subject-card,.tabs,.panel,.result,.banner,.empty,.card-form,.card-list,.option,.note-item,.history,.review{background:var(--sheen), var(--glass);border:1px solid var(--line);box-shadow:var(--rim), var(--shadow)}.topbar,.hero-search,.stat,.subject-card,.tabs{-webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur)}.app{min-height:100vh;position:relative}.ambient{--ambient-hue:22;z-index:-1;pointer-events:none;background:radial-gradient(70% 60% at 50% 0%, oklch(var(--amb-l) .2 var(--ambient-hue) / var(--amb-a)), transparent 75%), radial-gradient(45% 45% at 0% 25%, oklch(var(--amb-l) .17 calc(var(--ambient-hue) - 35) / var(--amb-b)), transparent 70%), radial-gradient(50% 50% at 100% 90%, oklch(var(--amb-l) .15 285 / var(--amb-c)), transparent 70%);transition:--ambient-hue .9s;position:fixed;inset:0}.ambient:after{content:"";background-image:linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);background-position:50% -1px;background-size:56px 56px;height:75vh;position:absolute;inset:0 0 auto;-webkit-mask-image:radial-gradient(80% 90% at 50% 0,#000 20%,#0000 75%);mask-image:radial-gradient(80% 90% at 50% 0,#000 20%,#0000 75%)}.topbar{top:max(10px, env(safe-area-inset-top,0px));z-index:20;width:min(992px,100% - 20px);margin:max(10px, env(safe-area-inset-top,0px)) auto 0;background:var(--sheen), var(--glass-strong);border-radius:18px;align-items:center;gap:6px;padding:6px 6px 6px 10px;display:flex;position:sticky}.brand{letter-spacing:-.015em;border-radius:10px;align-items:center;gap:10px;padding:4px 8px 4px 2px;font-size:1rem;font-weight:650;text-decoration:none;display:inline-flex}.brand-mark{background:linear-gradient(140deg,#ff8a5c,#ff4f64 55%,#e02f5c);border-radius:8px;flex:none;width:26px;height:26px;position:relative;box-shadow:inset 0 1px #ffffff73,inset 0 -1px #0000002e,0 4px 14px -4px #ff505ab3}.brand-mark:before,.brand-mark:after{content:"";border-radius:2.5px;position:absolute}.brand-mark:before{background:#ffffff80;width:12px;height:9px;top:6px;left:8.5px;transform:rotate(8deg)}.brand-mark:after{background:#fff;width:14px;height:10px;top:9.5px;left:5.5px;transform:rotate(-7deg);box-shadow:0 1px 2px #78001459}.topnav{align-items:center;gap:2px;display:flex}.topnav a{color:var(--ink-2);border-radius:11px;padding:7px 12px;font-size:.925rem;font-weight:550;text-decoration:none;transition:color .2s,background-color .2s}.topnav a.active{color:var(--ink);background:var(--sel);box-shadow:var(--rim)}.top-actions{align-items:center;gap:6px;margin-left:auto;display:flex}.palette-trigger,.chip{border:1px solid var(--line);background:var(--glass-2);height:36px;box-shadow:var(--rim);color:var(--ink-2);font:inherit;cursor:pointer;border-radius:12px;align-items:center;gap:8px;padding:0 12px;font-size:.875rem;font-weight:500;transition:background-color .2s,border-color .2s,color .2s;display:inline-flex}.palette-trigger{padding-right:6px}.pt-keys{gap:3px;margin-left:6px;display:inline-flex}.page{flex-direction:column;gap:28px;max-width:960px;margin:0 auto;padding:36px 16px 88px;display:flex}.narrow{max-width:640px}.row{align-items:center;gap:8px;display:flex}.row.wrap{flex-wrap:wrap}.between{justify-content:space-between}kbd{min-width:22px;height:22px;font:600 .72rem/1 var(--font);color:var(--ink-2);background:linear-gradient(180deg, var(--key-top), var(--key-bottom));border:1px solid var(--line-2);box-shadow:var(--rim);border-bottom-width:2px;border-radius:6px;place-items:center;padding:0 6px;display:inline-grid}.btn{background:var(--primary);min-height:40px;color:var(--primary-ink);box-shadow:var(--primary-rim), 0 1px 2px #00000040, 0 8px 20px -10px #0009;font:inherit;cursor:pointer;transition:transform .18s var(--ease), box-shadow .25s var(--ease), background-color .2s, border-color .2s, opacity .2s;border:1px solid #0000;border-radius:12px;justify-content:center;align-items:center;gap:8px;padding:8px 16px;font-size:.925rem;font-weight:600;text-decoration:none;display:inline-flex}.btn:active:not(:disabled){transform:scale(.97)}.btn:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}.btn.ghost{background:var(--glass-2);color:var(--ink);border-color:var(--line-2);box-shadow:var(--rim)}.btn.danger,.btn.bad{background:var(--bad-bg);color:var(--bad);border-color:color-mix(in srgb, var(--bad) 35%, transparent);box-shadow:var(--rim)}.btn.good{background:var(--good-bg);color:var(--good);border-color:color-mix(in srgb, var(--good) 35%, transparent);box-shadow:var(--rim)}.btn.big-btn{border-radius:14px;min-height:50px;font-size:1rem}.btn kbd{min-width:20px;height:20px;color:inherit;border-color:color-mix(in srgb, currentColor 30%, transparent);box-shadow:none;opacity:.85;background:0 0}.link-btn{color:var(--accent);font:inherit;cursor:pointer;text-decoration:underline;-webkit-text-decoration-color:color-mix(in srgb, var(--accent) 40%, transparent);text-decoration-color:color-mix(in srgb, var(--accent) 40%, transparent);text-underline-offset:4px;background:0 0;border:none;align-self:flex-start;padding:0;font-weight:600}.confirm{flex-wrap:wrap;align-items:center;gap:6px;display:inline-flex}.confirm-q{color:var(--bad);font-size:.9rem;font-weight:600}:where(input:not([type=checkbox],[type=file],[type=radio])),textarea{border:1px solid var(--line-2);background:var(--field);width:100%;min-width:0;color:var(--ink);font:inherit;border-radius:12px;padding:10px 14px;transition:border-color .2s,box-shadow .2s,background-color .2s;box-shadow:inset 0 1px 2px #0000001f}input::placeholder,textarea::placeholder{color:var(--ink-3);opacity:1}input:focus,textarea:focus{border-color:color-mix(in srgb, var(--accent) 70%, transparent);box-shadow:0 0 0 4px color-mix(in srgb, var(--accent) 22%, transparent);outline:none}textarea{resize:vertical;line-height:1.6;font-family:var(--font-text)}.field{flex-direction:column;gap:6px;min-width:0;display:flex}.label{color:var(--ink-2);font-size:.875rem;font-weight:600}.toggle{color:var(--ink-2);cursor:pointer;align-items:center;gap:10px;font-size:.925rem;display:inline-flex}.toggle input{appearance:none;cursor:pointer;background:radial-gradient(circle closest-side, #fff 90%, transparent) 2px 50% / 20px 20px no-repeat, var(--switch-off);width:40px;height:24px;box-shadow:inset 0 0 0 1px var(--line), inset 0 1px 2px #00000040;transition:background-position .32s var(--spring), background-color .25s;border-radius:99px;flex:none;margin:0}.toggle+.toggle{margin-left:10px}.toggle input:checked{background-color:var(--accent);background-position:calc(100% - 2px)}.seg{background:var(--track);border:1px solid var(--line);border-radius:13px;flex-wrap:wrap;align-self:flex-start;gap:2px;padding:3px;display:inline-flex}.seg button{color:var(--ink-2);font:inherit;cursor:pointer;font-variant-numeric:tabular-nums;background:0 0;border:none;border-radius:10px;padding:7px 16px;font-size:.9rem;font-weight:600;transition:background-color .2s,color .2s,box-shadow .2s}.seg button[aria-checked=true]{background:var(--seg-on);color:var(--ink);box-shadow:var(--rim), 0 2px 8px -2px #0000004d}.hero{text-align:center;flex-direction:column;align-items:center;gap:14px;padding:26px 0 4px;display:flex}.badge{color:var(--ink-2);border-radius:99px;align-items:center;gap:8px;padding:5px 12px 5px 10px;font-size:.8rem;font-weight:550;display:inline-flex}.badge-dot{background:var(--accent);width:7px;height:7px;box-shadow:0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent), 0 0 12px var(--accent);border-radius:50%}.hero h1{letter-spacing:-.045em;max-width:15ch;padding-bottom:.06em;font-size:clamp(2.3rem,1.4rem + 3.6vw,3.6rem);line-height:1.05}@supports ((-webkit-background-clip:text) or (background-clip:text)){.hero h1{background:linear-gradient(180deg, var(--ink) 35%, var(--ink-fade));color:#0000;-webkit-background-clip:text;background-clip:text}}.hero-sub{text-wrap:balance;max-width:44ch;font-size:1.05rem}.hero-search{width:min(560px,100%);height:54px;color:var(--ink-3);font:inherit;text-align:left;cursor:text;box-shadow:var(--rim), var(--shadow), 0 0 0 0 transparent;transition:border-color .25s, box-shadow .3s var(--ease), transform .3s var(--ease);border-radius:16px;align-items:center;gap:12px;margin-top:10px;padding:0 12px 0 18px;font-size:1rem;display:flex}.hero-search .pt-label{white-space:nowrap;text-overflow:ellipsis;flex:1;min-width:0;overflow:hidden}.stats{grid-template-columns:repeat(3,1fr);gap:12px;margin:0;display:grid}.stat{border-radius:var(--radius);flex-direction:column-reverse;gap:2px;padding:16px 18px;display:flex}.stat dt{color:var(--ink-3);font-size:.8rem;font-weight:500}.stat dd{letter-spacing:-.04em;font-variant-numeric:tabular-nums;margin:0;font-size:1.85rem;font-weight:650;line-height:1.15}.stat small{color:var(--ink-3);letter-spacing:0;font-size:.55em;font-weight:500}.subject-grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,260px),1fr));gap:14px;display:grid}.subject-card{isolation:isolate;border-radius:var(--radius-lg);transition:transform .4s var(--ease), border-color .25s, box-shadow .4s var(--ease);flex-direction:column;gap:6px;padding:18px;text-decoration:none;display:flex;position:relative;overflow:hidden}.subject-card:before{content:"";z-index:-1;background:radial-gradient(260px circle at var(--mx,50%) var(--my,0%), oklch(var(--tab-l) var(--tab-c) var(--hue) / .2), transparent 65%);opacity:0;transition:opacity .3s;position:absolute;inset:0}.subject-card:after{content:"";background:linear-gradient(90deg, transparent, oklch(var(--tab-l) var(--tab-c) var(--hue) / .8), transparent);height:1px;position:absolute;inset:0 12% auto}.card-top{justify-content:space-between;align-items:flex-start;margin-bottom:10px;display:flex}.go{color:var(--ink-3);opacity:0;transition:opacity .25s, transform .4s var(--ease);font-size:1.1rem;line-height:1;transform:translate(-4px,4px)}.subject-card h2{overflow-wrap:anywhere;font-size:1.15rem}.subject-icon{background:linear-gradient(140deg, oklch(68% .15 var(--hue)), oklch(48% .18 calc(var(--hue) + 35)));color:#fff;text-shadow:0 1px 2px #0000004d;width:40px;height:40px;box-shadow:inset 0 1px 0 #fff6, inset 0 -2px 4px #00000026, 0 8px 20px -8px oklch(55% .2 var(--hue) / .8);border-radius:12px;flex:none;place-items:center;font-size:1.2rem;font-weight:700;line-height:1;display:grid}.subject-icon.lg{border-radius:16px;width:54px;height:54px;font-size:1.55rem}.subject-icon.sm{border-radius:8px;width:28px;height:28px;font-size:.85rem;box-shadow:inset 0 1px #ffffff59}.meter{background:var(--track);border-radius:99px;height:5px;margin-top:8px;overflow:hidden}.meter span,.progress span{border-radius:inherit;background:linear-gradient(90deg, oklch(var(--tab-l) var(--tab-c) var(--hue,22)), oklch(var(--tab-l) var(--tab-c) calc(var(--hue,22) + 45)));height:100%;box-shadow:0 0 12px oklch(65% .2 var(--hue,22) / .55);display:block}.meter span{transform-origin:0;animation:grow .9s var(--ease) backwards;animation-delay:calc(.3s + var(--i,0) * 45ms)}.add-card{border-style:dashed;border-color:var(--line-2);box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;background:0 0;gap:10px}.add-card:after{content:none}.add-icon{border:1px dashed var(--line-2);width:40px;height:40px;color:var(--ink-2);border-radius:12px;place-items:center;display:grid}.add-card label{letter-spacing:-.02em;font-size:1.15rem;font-weight:650}.subject-head{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px;display:flex}.subject-title{align-items:center;gap:14px;min-width:0;display:flex}.subject-title h1{overflow-wrap:anywhere}.subject-head form input{max-width:320px}.swatches{flex-wrap:wrap;gap:6px;display:flex}.swatch{border:2px solid var(--bg);background:oklch(var(--tab-l) var(--tab-c) var(--hue));width:26px;height:26px;box-shadow:0 0 0 1px var(--line-2);cursor:pointer;transition:transform .2s var(--spring);border-radius:50%}.swatch[aria-checked=true]{box-shadow:0 0 0 2px var(--ink);transform:scale(1.1)}.tabs{scrollbar-width:none;border-radius:15px;gap:4px;width:fit-content;max-width:100%;margin:22px 0 26px;padding:4px;display:flex;overflow-x:auto}.tabs a{color:var(--ink-3);border-radius:11px;flex:none;align-items:center;gap:7px;padding:8px 14px;font-size:.925rem;font-weight:600;text-decoration:none;transition:color .2s,background-color .25s,box-shadow .25s;display:inline-flex}.tabs a.active{color:var(--ink);background:var(--seg-on);box-shadow:var(--rim), 0 2px 10px -2px #0000004d}.tabs a.active .icon{color:oklch(var(--hue-ink-l) .15 var(--hue))}.count{background:var(--track);min-width:20px;color:var(--ink-2);text-align:center;font-variant-numeric:tabular-nums;border-radius:99px;padding:1px 6px;font-size:.72rem;font-weight:600}.empty{border-style:dashed;border-color:var(--line-2);border-radius:var(--radius-lg);flex-direction:column;align-items:flex-start;gap:10px;padding:32px 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